Glass composition for low temperature sintering, dielectric composition and multilayer ceramic capacitor using the same

Abstract

The invention relates to a glass composition and a glass frit adequate for low temperature sintering agent at 1,100° C. or less, and a dielectric composition and a multilayer ceramic capacitor using the same. The glass composition comprises aLi 2 O-bK 2 O-cCaO-dBaO-eB 2 O 3 -fSiO 2 , in which a, b, c, d, e and f satisfy following relationships: a+b+c+d+e+f=100, 2≦a≦10, 2≦b≦10, 0≦c≦25, 0≦d≦25, 5≦e≦20, and 50≦f≦80.

1. A dielectric composition comprising:
 a main component of BaTiO 3 ; and 
 sub-components containing a glass composition expressed by a formula: aLi 2 O-bK 2 O-cCaO-dBaO-eB 2 O 3 -fSiO 2 , where a+b+c+d+e+f=100, 2≦a≦10, 2≦b≦10, 0≦c≦25, 0≦d≦25, 5≦e≦20, and 50≦f≦80, 
 wherein the sub-components comprise, based on 100 mole of the main component, 1.0 to 3.0 mole of the glass composition, 0.5 to 2.0 mole of MgCO 3 , 0.3 to 1.0 mole of rare earth oxide and 0.05 to 1.0 mole of MnO, where the rare earth oxide is at least one selected from a group consisting of Y 2 O 3 , Ho 2 O 3 , Dy 2 O 3  and Yb 2 O 3 . 
 
     
     
       2. The dielectric composition of  claim 1 , wherein a, b, c, d, e and f satisfy following relationships: 3≦a≦8, 2≦b≦5, 0≦c≦15, 0≦d≦15, 10≦e≦20, and 55≦f≦75. 
     
     
       3. The dielectric composition of  claim 1 , wherein a, b, c, d, e and f satisfy following relationships: 3≦a≦8, 2≦b≦5, 0≦c≦15, 5≦d≦15, 12.5≦e≦17.5, and 60≦f≦75. 
     
     
       4. A multilayer ceramic capacitor comprising a plurality of dielectric layers, a plurality of internal electrodes alternating with the dielectric layers and external electrodes electrically connected to the internal electrodes,
 wherein each of the dielectric layers comprises a main component of BaTiO 3  and sub-components containing a glass composition expressed by a formula: aLi 2 O-bK 2 O-cCaO-dBaO-eB 2 O 3 -fSiO 2 , where a+b+c+d+e+f=100, 2≦a≦10, 2≦b≦10, 0≦c≦25, 0≦d≦25, 5≦e≦20, and 50≦f≦80, 
 wherein the sub-components comprise, based on 100 mole of the main component, 1.0 to 3.0 mole of the glass composition, 0.5 to 2.0 mole of MgCO 3 , 0.3 to 1.0 mole of rare earth oxide and 0.05 to 1.0 mole of MnO, where the rare earth oxide is at least one selected from a group consisting of Y 2 O 3 , Ho 2 O 3 , Dy 2 O 3  and Yb 2 O 3 . 
 
     
     
       5. The multilayer ceramic capacitor of  claim 4 , wherein a, b, c, d, e and f satisfy following relationships: 3≦a≦8, 2≦b≦5, 0≦c≦15, 0≦d≦15, 10≦e≦20, and 55≦f≦75. 
     
     
       6. The multilayer ceramic capacitor of  claim 4 , wherein a, b, c, d, e and f satisfy following relationships: 3≦a≦8, 2≦b≦5, 0≦c≦15, 5≦d≦15, 12.5≦e≦17.5, and 60≦f≦75. 
     
     
       7. The multilayer ceramic capacitor of  claim 4 , wherein the internal electrodes contain Ni or Ni alloy as a conductor.